Shares of semiconductor equipment and subsystem provider Ichor Holdings (NASDAQ: ICHR) jumped on Tuesday after the company released preliminary first-quarter results. Ichor also announced that existing shareholders planned to sell 4.5 million shares in a public offering, but the stock still closed up 10.4%.Ichor expects to produce first-quarter revenue of $148.7 million, toward the high end of its previous guidance range of $140 million to $150 million.